I have an array like this,
const data =[
{ date: 2022-04-11T15:08:54.223Z, coordinates: [Object] },
{ date: 2022-04-11T15:09:36.078Z, coordinates: [Object] },
{ date: 2022-04-11T15:18:18.405Z, coordinates: [Object] },
{ date: 2022-04-11T15:19:45.228Z, coordinates: [Object] },
{ date: 2022-04-11T15:21:00.188Z, coordinates: [Object] },
]
I want to return data based on time intervals, that is like, say the interval is 2 minutes and the time of the first element is 11:00 am then only the elements of the array with time 11:02 am, 11:04 am, 11:06 am. etc. If the interval is 3 minutes, then elements with time 11:03 am, 11:06 am... should be returned. I have tried different methods. It is not working. Can you guys help me with a solution with more efficiency?
If you didn't understand my question,
Elements in the array
Element :: Mon Apr 11 2022 20:39:36 GMT+0530 (India Standard Time)
Element :: Mon Apr 11 2022 20:40:36 GMT+0530 (India Standard Time)
Element :: Mon Apr 11 2022 20:41:36 GMT+0530 (India Standard Time)
Element :: Mon Apr 11 2022 20:42:36 GMT+0530 (India Standard Time)
Element :: Mon Apr 11 2022 20:43:36 GMT+0530 (India Standard Time)
Element :: Mon Apr 11 2022 20:44:36 GMT+0530 (India Standard Time)
Element :: Mon Apr 11 2022 20:45:36 GMT+0530 (India Standard Time)
Element :: Mon Apr 11 2022 20:46:36 GMT+0530 (India Standard Time)
If I set the time interval as 2 minutes
The records should be returned like this
Element :: Mon Apr 11 2022 20:39:36 GMT+0530 (India Standard Time)
Element :: Mon Apr 11 2022 20:41:36 GMT+0530 (India Standard Time)
Element :: Mon Apr 11 2022 20:43:36 GMT+0530 (India Standard Time)
Element :: Mon Apr 11 2022 20:45:36 GMT+0530 (India Standard Time)
a reduce method makes this pretty simple
let interval = 3,
firstDate;
let intervalArr = data.reduce((acc,entry)=>{
let date = new Date(entry.date) // should condition this in case prop is a string and not datetime, but should work as is
firstDate ||= date
let minutesSinceFirst = ~~((firstDate - date) / 60000)
// modulus will be 0 if min is divisible by interval
if (minutesSinceFirst % interval === 0)
acc.push(entry) // push to accumulator
return acc
}, []) // accumulator starts as an empty array
firstDate = null